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Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect

Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect

Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago - last edited a week ago
Tags: #Network Connectivity #Firmware Update #Access Point Mode
Model: Deco X20  
Hardware Version:
Firmware Version: 1.3.0

 

Deco model & firmware: Deco X20, 6 units total (2x 3-pack), all in one network, firmware 3x 1.3.0 build 20250722 Rel. 50004 (hardware v3.20) and 3x 1.3.0 Build 20250912 Rel. 56370 (hardware v2.0)

Operation mode: Access Point (AP) mode

What's happening:
When my iPhones come home and reconnect to the WiFi, they receive a DHCP IP address successfully but have no internet connection for several minutes. Local network access also fails during this period.

 

What I've confirmed through testing:

  • DHCP is working — tcpdump on my Raspberry Pi DHCP server shows a clean Request → ACK with correct IP, gateway and DNS
  • No rogue DHCP servers on the network (already resolved that separately)
  • My laptop can ping the iPhone's IP during the outage
  • The iPhone cannot reach anything — not the internet, not the gateway, not the DHCP server
  • My Raspberry Pi cannot ping the iPhone during the outage
  • The problem resolves itself after a few minutes without any intervention

 

AI's conclusion: 

The Deco pod appears to complete WiFi association and pass DHCP traffic, but might not add the iPhone to its bridging table immediately, dropping all other traffic until something triggers it.

 

What I've already tried:

  • Enabled Fast Roaming
  • Disabled Mesh Technology per client for the iPhones
  • Private Wi-Fi Address disabled on both iPhones
  • Static DHCP leases for both iPhones

 

Network setup:

  • ISP modem (Mobile Vikings) → 2x Cisco switches (L2) → 6x Deco X20 in AP mode
  • Raspberry Pi 5 running AdGuard Home (DHCP + DNS)
  • All devices on a single /23 subnet

 

 

Has anyone seen this behaviour? Is this a known bridging table delay bug in AP mode?

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#1
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6 Reply
Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago

  @guidofr 

Hi,
Please confirm the following information for the report phenomenon.


  1. Are the 6x Deco X20 connected to the two switches by an ethernet cable? Is the Raspberry Pi 5 connected to a switch by a cable?
  2. Is your iPhone connected to the Deco's main Wi-Fi network rather than the guest network?
  3. When the Raspberry Pi 5 can't ping the iPhone's IP address, can it ping the other phones/laptops connected to the same Deco as the iPhone?

 

Best Regards

>> Check What's Currently Going on With Deco >> Deco X50/X50Pro/X50-PoE Pre-Release Firmware 1.7.0 Introduces DoH/DoT, Channel Selection, and More! >> Deco XE75/XE5300/XE75Pro V1 Pre-release Firmware 1.5.0 Introduces DoH/DoT, WireGuard VPN, and More!
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#2
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Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago - last edited a week ago

  @Solla-topee 

1. I tried removing 2 pods for the moment (maybe it was to much i don't know, I took out 2 of the older hardware models) but 3/4 are connected by cable directly to the switches, one is connected via the mesh network. The main one is one of the cabled pods. Pi is also connected via cable.

2. It is connected to the main network, not guest or iot

3. The pi can ping to other devices connected to the same deco (my laptop)

 

Some extra info since today:

  • Pi has iPhone in ARP table but cannot ping it during outage
  • Traceroute fails completely during outage
  • ARP requests are intermittently dropped (needed two attempts)
  • Everything resolves on its own after a few minutes
  • No change in Pi's ARP table between working and non-working state

 

Kind regards

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#3
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Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago

  @guidofr 

Hi,
If your ISP modem has Wi-Fi network, please connect your iPhone to the modem's Wi-Fi and check if the same phenomenon occurs.
Best Regards

>> Check What's Currently Going on With Deco >> Deco X50/X50Pro/X50-PoE Pre-Release Firmware 1.7.0 Introduces DoH/DoT, Channel Selection, and More! >> Deco XE75/XE5300/XE75Pro V1 Pre-release Firmware 1.5.0 Introduces DoH/DoT, WireGuard VPN, and More!
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#4
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Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago

  @Solla-topee 

Had to re-enable to modems wifi but, on the modem there was no problem on the wifi while on the deco network it wasn't working. 

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#5
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Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
a week ago

Kept on digging a bit more:

  • iPhone repeatedly sends IPv6 neighbor solicitations for the modem's link-local address
  • Modem never responds to the iPhone's solicitations
  • Pi (connected via ethernet through Cisco switches) can reach the modem via IPv6 fine
  • tcpdump on the Pi confirms the iPhone's neighbor solicitations are visible on the network but get no response

 

Suspected AI cause: Deco pods in AP mode are not properly forwarding IPv6 multicast frames from wireless clients to the wired network

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#6
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Re:Deco X20 AP mode — iPhone gets DHCP but no internet, Pi cannot ping iPhone until reconnect
Monday

  @guidofr 

Hi, 
I have escalated your case to our tech team, and they will contact you via email to assist you further. Please wait patiently.
Best Regards
 

>> Check What's Currently Going on With Deco >> Deco X50/X50Pro/X50-PoE Pre-Release Firmware 1.7.0 Introduces DoH/DoT, Channel Selection, and More! >> Deco XE75/XE5300/XE75Pro V1 Pre-release Firmware 1.5.0 Introduces DoH/DoT, WireGuard VPN, and More!
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#7
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Replies: 6

Tags

Network Connectivity Firmware Update Access Point Mode